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You can't max out your stock turbo on JB4. You need a full tune to do that. On ecutek, I run 25 psi. Around 27 is the max. Anything past that, it won't last very long. Also, JB4 does not control timing. On the e30 JB4 map, you will get a bit more boost.
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2014 BMW 335i M-Sport - SOLD
2020 BMW M340i - SOLD
2021 BMW X3M
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